CVE-2025-20128: ClamAV OLE2 File Format Decryption Denial of Service Vulnerability
A vulnerability in the Object Linking and Embedding 2 (OLE2) decryption routine of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to an integer underflow in a bounds check that allows for a heap buffer overflow read. An attacker could exploit this vulnerability by submitting a crafted file containing OLE2 content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to terminate the ClamAV scanning process, resulting in a DoS condition on the affected software. For a description of this vulnerability, see the . Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
Affected Software
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2025-20128?
The severity of CVE-2025-20128 is critical due to its potential to cause a denial of service condition.
How do I fix CVE-2025-20128?
To fix CVE-2025-20128, update ClamAV to a patched version as specified in the relevant security advisories.
Who is affected by CVE-2025-20128?
CVE-2025-20128 affects users of ClamAV versions up to 1.4.1 and various iterations of earlier releases.
What type of vulnerability is CVE-2025-20128?
CVE-2025-20128 is an integer underflow vulnerability in the OLE2 decryption routine.
Can CVE-2025-20128 be exploited remotely?
Yes, CVE-2025-20128 can be exploited by unauthenticated remote attackers to induce a denial of service.